How to make a non-sticky glass plate

[mulder at saturn.med.nyu]

To avoid the gel from stick on both of the  glass plates, I was used to
treat both the plates with silan , one 2 times and the other four or
five times, meaning treat-dry-treat again etc. I know it sounds a waste
of material but it always worked for me. Make sure to wash yor plates
with detergent and rins them with ethanol before appling the silan.
Hope it helps

Ben